Deevey, 1974
Short description:
Chiridiella gibba is an aetideid calanoid copepod known after female (2.58-3.00 mm in length), was recorded from the Indian Ocean and the Kurile-Kamchatka Trench region.
Taxonomic description:
Female. Total length 2.58-3.00 mm. Cephalothorax about 4 times longer than abdomen. Anterior part of cephalon compressed laterally nearly the area of A1. Anterior border of lateral skeleton structures of genital field wavy (lateral view). A1 24-segmented, reaching the middle of abdomen, or longer than body. Re A2 1.6 times longer than Ri, external lobe of Ri2 A2 with 6, internal with 5 long and 2 short setae; setae on coxo- and basipodite were not visible. Ri2 Md with 1 seta. Mx1 gnathobase with 9 setae, second internal lobe reduced, third with 2 setae, Ri with 3 setae, Re reduced, on external lobe there are 7 setae. Mx2 of Ch. macrodactyla type, corresponds with that described for Ch. gibba (Deevey, 1974), the only difference: the small additional seta was not visible on the first endite. Mxp protopodite with 1 seta in distal part, Ri1 Mxp with 2 setae in medial group (sometimes there is 1 seta). Re P1 with 1 terminal external spine, Ri P1 external lobe reduced. Ri P2 - one-, Re indistinctly 3-segmented. Re P3-P4 - 3-segmented. Ri indistinctly 3-segmented. P4 protopodite with rudimentary internal seta, hairs absent.
Vertical distribution:
The species was found in the hauls between 500 and 1500 m (Deevey, 1974), and in haul 1050-1500 m from the Kurile-Kamchatka Trench region (Markhaseva, 1996).
Geographical distribution:
The Sargasso Sea (Deevey, 1974). The species is recorded in the Pacific Ocean: the Kurile-Kamchatka Trench area and in the Indian Ocean in the western part (Markhaseva, 1996).
Type locality: 32°10'N 64°30'W (Deevey, 1974).
Material examined:
3 females from samples : 93, 398. See examined samples module.